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If A+B+C=π,prove that cos A/(sin B sin C)+cos B/(sin A sin C)+cos C/(sin A sin B)=2.
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1 year ago
If A+B+C=π,prove that cos A/(sin B sin C)+cos B/(sin A sin C)+cos C/(sin A sin B)=2.
![Law of Cosines - Formula, Examples \& Proof - [2-20-4]](http://i.ytimg.com/vi/ac25DrPYSoc/mqdefault.jpg "Law of Cosines - Formula, Examples \& Proof - [2-20-4]")
